Grinding-machine.



L. W. BUGBEB. GRINDING MACHINE. APPLIOATION FILED 00w. e, um.

1,1 1 3,930. Patented Oct. 13,1914.

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LUCIA'N W. BUGBEE. OF SOUTI-IBRIDGE, MASSACHUSETTS.

GRINDING-MACHINE.

Application filed October 8, 1912. Serial No. 724,513.

To all 2107mm it may concern:

Be it known that I, LUCIAN IV. BUGBEE, a citizen of the United States,'residing at Southbridge, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Grinding-Machines, of which the following 1s a specification.

invention relates to improvements in grinding tools, and has particular reference to an imprm'ed device for use in grinding individual cylinder or toric lenses.

The leading object.ofmy invention is the provision of a simple, durable, eitieient and inexpensive tool of this character which shall be so constructed that the various parts thereof are interchangeable and may be readily replaced in case of undue wear or breakage of said parts whereby the life of the tool as a whole will be prolonged to a maximum. I

A further object of my invention is the provision of a tool of this character in which the winding lap and block may be quickly and easily removed and changed without the necessity of employment of any tools whatever.

Another object of my invention is the provision of a device of this nature in which the pivot or main wearing points of the structure will he satisfardorily protected to prevent any access of the grinding or abrasive material thereto and thus to eliminate undue wearing at these points.

Other objects and advantages of my improved tool should be readily apparent by reference to the following description taken .in connection with the accompanying d 'awlugs, and it will be understood that I may make any modifications in the specific details of construction shown and described within the scope of the appended claim without departing from or exceeding the .spirit of my invention.

Specification of Letters Patent.

Patented Oct. 13, 1915.

having the socket 2 formed in the under side thereof to receive a rotating spindle for actuating the structure, said portion 1 having depending therearound the frusto-conical or downwardly flaring flange 3 adapted to cause the abrasive material to slide outwardly and away from the bearings of the spindle which fits into the socket 2. Rising centrally from the base member is a reduced upwardly tapering spindle portion 4 adapted to fit into the socket 5 of the base 6 of the tool 7 which I have shown inthe drawings as forming the lap or grinding member for operating upon a lens, although it'will be understood that if desired the lens may be correct position relative to the main structure. 7

As will be understood by those conversant with the art of grinding cylinder, torie and like lenses, it is essential that these lenses be ground with a cetrain curve in one directi on and a certain dilicrent curve in the opposite direction, and it is further necessary to see that during the grinding operation there is no variance as to the axes of these curves as such a variance would prove fatal to the correct grinding of the lenses. My structure, as above stated, is for use in so grinding lenses, and the interlocking lug and slot thus described insures the correct positioning of the lap. To insure the exact positioning of the block on which the lens is mounted relative to the lap I pivotally mount on the base member 1 the annulus or ring 10 having extending upward therefrom at diametrically opposite points the lugs 11 each of which has a pair of sockets 12 formed therein and is split by the kerf 13 to form a pair of slightly spaced semi-resilient furcations each having a portion of the sockets 12 therein. These sockets may be either angular or circular in form and are adapted to receive the lower ends of the guide membars 14 which extend upward in parallel relation a considerable distance above the furc'ated lugs. To secure the, said guides 14k in placeand yet permit of the removal thereof either to entirely replace the same or to permit of placin a new face inward to receive the wear 0' the lap handle or guide rod 15, I loosely engage in one of the furcations of each lug a screw or like clamping device 16 whose head bears against said furcation and whose other end has threaded engagement with the opposite furcation, tightening of the screw drawing the semircsilien't tiircations toward each other and thus narrowing the kerf and the width of the sockets and securely clamping the lower ends oi the guides in place.

I have previously mentioned that the ring or annulus is pivotally secured to the base, the vexact method of forming this pivotal connection will be-best understood by reference to the section shown in Fig. II, from which itwill be seen that there extend outward from the shield member 3 at diametrically opposite points the lugs 17 having preferably embedded therein the removable bearing blocks 18, into which fit the inner ends of the pivot screws 19, said screws extending inward from the annulus or ring with which they have threaded engagement, lock nuts 20 being engaged on the outer ends of the screws for securing the same in desired adjusted position. It will thus be seen that the screws may be quickly and easily removed when the ring and guides may be lifted oil of the base portion for r placement or cleaning, it the bearing blocks are tooZInuch worn, the same being readily removable, while setting of the screws in t esired adjusted position and in correct en gagement with the bearings 18 pivotal" mounts the ring in desired position relative to the lap bearing spindle 4:.

In the grinding of a lens on my device abrasive is placed on the portion 7 of the lap and naturally durin the operation of the structure said abrasive will drip or drop down from the lap and on account of the centrifugal force caused by the rotation of the complet tool this abrasive would naturally tend to get on the pivot screw or bearing and thus quickly wear out these bearing points. To prevent an action oi this nature I form at the end oi? each lug I? the semicircumscribinp; outwardly projecting flange 21 which projects upward into a groove or recess 22formed for this purpose in the under portion of the ring or arnulus and guide lug, the interlocking of the flange and groove being sutlicient to prevent. under ordinary circumstances, access of abrasive material to the bearings. In some instances it 'ill be found desirable, however, to take, additional precautions against undue wearing of the pivot bearing, and when this is the case I may elongate the bearing aperture in which the block 18 fits in such manner as to provide the integral or inserted cone bearing face engaged by the tapered end of the screw and adjacent this a socket to receive a washer member 23, said washer being preferably oi some fibrous material as shown in Fig. V which will tightly engage the body of the pivot screw to prevent absolutely any entrance of abrasive material into the bearing; proper. a second washer oi' metal or other still substance 2t holding the librous washer in place. In this form it is practically ilnpos ihle for an abrasive to into the bearing. while an. aperture 2:3 formed in the undc. ide of the dependiim hield It and connecting with the cone bcarir ,"l'l'llils ol oiling thereof as may prove nccwsary.

From the i 'fil'tfjOlllgl' descripliim taken in connection with the zu-cmupanyiug drawings the construction of my improved grinding tool and the po sibility of readily assembling, d'sasscmbliu and replacing oi the parts thereof should be readily umlerstood.

I claim:

A tool of the character described, includinc a base. a shield member depending; around and flaring outwardly from said base, said shield having portions projecting from diametrically oposite sides thereofisaid portions having pivot bearings lormcd therein an annulus having pivots :uljustably engaged in the said bearings. said annulus having lugs projectingupwardly therefrom at diametrically Opl Hb-LltO points thereon and disposed above the pivots carried by the annulus, and spaced guide members removably secured to and extending upward from the said lugs of the annulus.

in testimony whet-c t I allix my mtulc in presence of two witnesses.

BUG BEE.

l' v itnesses ll. K. Pausoxs, E. M. Snnnman. 

